# Positive Volume Index Positive Volume Index is an indicator on [Vela](https://vela.luxalgo.com/chart), our next-generation charting platform, written in Pine Script®. The Positive Volume Index compounds a cumulative line by each bar's percentage price change only on sessions where volume rises above the prior bar, holding flat otherwise from a seed of 1000. A 255-period signal EMA anchors the classic regime read (bullish above the average, bearish below) with regime coloring, a gradient fill, and alerts on crosses and slope turns. - Indicator in the LuxAlgo Library, by LuxAlgo, published Jun 2, 2026. - Access: free. - Concepts: [Positive Volume Index](https://www.luxalgo.com/library/concept/positive-volume-index/) (primary) - Open on Vela: https://vela.luxalgo.com/chart?pineScriptCodeId=q2y5n68yk5znxtdgw3iw3mky - Page: https://www.luxalgo.com/library/indicator/positive-volume-index/ **Positive Volume Index** isolates what price does on the crowd's days: the line compounds by the bar's percentage change only when volume rises above the previous session's, and holds flat on every other bar. The definitive clean build of the [Positive Volume Index](https://www.luxalgo.com/library/concept/positive-volume-index/) seeds the line at 1000, pairs it with the long signal EMA that anchors the classic regime read, and colors everything by that regime: bullish while PVI holds above its average, bearish below it, neutral before the average has formed. ## How to Trade the Positive Volume Index? - **PVI above its signal EMA**: high-participation sessions are trending above their own long-run norm, the classic bullish environment read, with an alert on the cross above. - **PVI below its signal EMA**: the bearish environment, alerted on the cross below. - **Slope turns**: PVI only moves on rising-volume sessions, so a turn in the line marks the latest high-participation day changing sides. The PVI Turned Rising and PVI Turned Falling alerts fire whenever the line moves up (or down) after a bar where it did not, so they also fire on the first move after any flat stretch, not only on true reversals. The line's absolute level carries no information (it depends on the seed and where data begins), so the reads are slope and position against the average. PVI is slow by construction and suits regime filtering over trade timing. ## Positive Volume Index Settings - **Source** (default close): series whose one-bar percentage change moves the line on active sessions. - **Starting Value** (default 1000): seed of the cumulative line; it shifts the level without changing any read. - **Signal EMA** (default enabled, length 255): the long average behind the regime read, roughly a trading year on daily charts; hiding it keeps the coloring, fill, and alerts, all measured against it. - **Gradient Fill** (default enabled): shading between PVI and its average, strongest at the PVI value; remaining Style inputs set colors. ## Frequently Asked Questions ### How does PVI relate to the Negative Volume Index? They are mirror constructions: the [Negative Volume Index](https://www.luxalgo.com/library/indicator/negative-volume-index/) updates only on falling-volume sessions (the quiet days), while PVI updates on the expanding-volume ones. Run together, they show whether the loud days and the quiet days tell the same story. ### Why does the line go flat for long stretches? Any session whose volume fails to exceed the prior session's leaves PVI unchanged, so flat stretches mean participation is not expanding. Missing volume counts as inactive, and a symbol with no volume at all stops the study with an error. ### Does the starting value change the signals? No. The seed only sets where the cumulative line begins; crosses of the signal EMA and slope turns are identical at any seed because both compare the line against itself. ## Related indicators - [Oscillator Matrix](https://www.luxalgo.com/library/indicator/luxalgo-oscillator-matrix/) (Money Flow Index): markdown at https://www.luxalgo.com/library/indicator/luxalgo-oscillator-matrix.md - [LuxAlgo - Screener (OSC)](https://www.luxalgo.com/library/indicator/luxalgo-screener-osc/) (Money Flow Index): markdown at https://www.luxalgo.com/library/indicator/luxalgo-screener-osc.md - [Delta ZigZag](https://www.luxalgo.com/library/indicator/delta-zigzag/) (Weis Wave Volume): markdown at https://www.luxalgo.com/library/indicator/delta-zigzag.md - [Price Zone Oscillator](https://www.luxalgo.com/library/indicator/price-zone-oscillator/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/price-zone-oscillator.md - [OBV Divergence](https://www.luxalgo.com/library/indicator/obv-divergence/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/obv-divergence.md - [Smart Money Index](https://www.luxalgo.com/library/indicator/smart-money-index/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/smart-money-index.md - [Trade Volume Index](https://www.luxalgo.com/library/indicator/trade-volume-index/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/trade-volume-index.md - [Volume Flow Indicator](https://www.luxalgo.com/library/indicator/volume-flow-indicator/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/volume-flow-indicator.md --- Source: https://www.luxalgo.com/library/indicator/positive-volume-index/ (LuxAlgo Library). Free to use with attribution: https://www.luxalgo.com/library/license/